I'm cleaning out the garage and moving all tree gear out to the shed. I found a couple old broken pole saws and was wondering if any one knows what this little springy thing is that's on the bottom of the saw head. The spring that is covering the hole through the head. I know, and have used it many, many times. Sorry no prize for getting it right. I figure that unless your old enough to have run splinters from the old fir poles through your hands you really don't know what it's for, Joe.